Running Junit sampler and configured to deliberate create a build failure (testing functionality). That is, set the "Use Relative thresholds for build comparison" to low values:
Performance: Percentage of relative difference outside -0.02 to +0.02 % sets the build as failure
Performance: Percentage of relative difference outside -0.01 to +0.01 % sets the build as unstable

However, build is still marked as a SUCCESS when expecting it to be marked FAILED/UNSTABLE.